Mechanical movement



UNITED STATES PATENT" @Erica HORACE WYMAN, OE WORCESTER, MASSACHUSETTS.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent vrNo. 264,595, dated September 19, 1882.

' Application led August 15, 1882. (No modelJ To cLZZ whom 'it may concern:

Be it known that I, HORACE WYMAN, of \Vort'ester,county of Worcester, State of Massachusetts, have invented an Improvement in Mechanical Movements, of'whieh thefollovving description, in connection with the accompanying drawings; is a specification.

This invention is an improvementon United States Patent No. 260,349, granted to meJune 27, 1882, to which reference may be had, and has for its Object to impart movement by re- 'ciproeating racks to the gears therein described as connected with the short shafts, which were tO be moved intermittinglya semi-rotation and be then left at rest. In that patent the said gears were engaged and turned for a semi-rotation by an iiitermittingly-rotating master-gear.,

The rack herein shown, besides 'being cheaper and easier to run than the master-gear referred to, also enables me to turn the said gear for halt' a rotation in either direction.

My invention consists essentially in a reciprocating rack-bar provided with teeth nea-r its opposite ends when combined with two gears having two series of teeth and intermediate teeth which may be engaged by the teeth ot' the rack-bar, or which may beso placed as to be out of the path of reciprocation Ot' the said rack-bar; also, in the combination,-With the Said rack-bar or othermovabletoothed surface, of gears and yielding journalboxes for the shafts carrying the said gears, whereby the said boxes and shafts may be moved bodily away from the Said rackbar or toothed surface actu-A ating them shonld the gears and teeth of the said rack-bar fail to become properly engaged when brought in contact. I

Figure l represents in side elevation a sut'- flcient portion of ameehanicalV movement to enable my invention to be understood.- Fig. 2 is alet't-hand end elevation of Fig. l. Figs. 3 and tare details of one ot' the yielding journal-boxes for the shafts which are to be turned bythe teeth of the raek-baror movable toothed Surface which engages the gears secured to the said shafts, and Fig. 5 is a horizontal sectional detail of one of the gears g.

The frame-Work A, of proper shape to support the Working parts, has proper bearings, a, t'or the main rotating shaft a2, provided with a crankpin, a3, which enters a slotted arm, a4, connected with and extended atright angles l from a reciprocating rack-bar, B, held in suit- The gears g herein shown and their inde! pendent isolated or movable teeth Z3 Z4, adapted to be placed alternately in line withthe teeth of the rack-bar, are as shown and de-cribed in my said patent'. The teeth Z3 Z4 to cO-opera-te with each gear g are carried by arms of a hub Or fork, g', having annular grooves(see Figs. 2 and 5) to receive pins or projections from levers e, such as described in my said patent, they being connected by wires e4 with Snita ble fingers resting on pattern-surfaces. (Not shown.) The two shafts c3 f4, link c, crankpin .0', and lever C are substantially as in my said patent; but in this instance the shat'tj'4 has at one end of it an eccentric, p, which serves as the fnlcrum ot' lever C. The lever C has a strap, r, with which a counterbalancing-weight maybe attached, as in my said patent. 1 Each shaft has upon it a holding-plate, c? orf, toV be engaged and held by holding devices m, substantially as Shown in my application No. 69,431, tiled concurrently with this; but in this application the said holding-plates are not claimed as they are claimed, in that application. The teeth L3 L4 are in dierent vertical planes with relation tothe teeth ofthe gear-g; and when one tooth, Z3 or Zl-say tooth Z4-by the movement of a lever, e, is placed in the line lOt' reciprocatiou ot' the said rack-bar, theteeth of the latter will first engage the said tooth Z3, and then, thel first tooth of the series of six teeth of the gear g at the rear ot' it; but as soon as the toothless space at the rear of the last tooth ot' the said series of teeth so engaged by the teeth ofthe rack-bar arrives uppermost or next the rack-barthe teeth of the rack-bar and the gear pass out ot' mesh, and the gear and its attached shaft iS then lett at rest until the hub is again shifted horizontally to place the tooth Z3 vin the line ot' reciprocation of the rackbar, after which the rackhar will engage it and then the series of teeth of gear g at the rear ot' it and turn the gear g half a rotation and again leave it at rest by reason of the toothless lspace at the Vend of the series of teeth Ot' the IOC) B and its return-stroke the gear g and its attached shaft maybe turned first in one and then in the opposite direction for half a rotation. The teeth Z3 Z4, it' left at rest while the bar B (it having just moved the gear g) is moved backward, will act to move the gear and its shaft interniittingly in but one direction; and when the gear is again to be moved in the same direction the teeth Z3 Z4 will be shifted to place one of them in line with the teeth of the rack-bar during that movement ofthe latter which is to be eiective. The shafts csf" are each supported in like boxes, h, pivoted at h toa stand or bracket fixed to the framework A. Each box receives through it a bolt, h3, the head of which rests on a spring, h4, ot' suitable strength, the nut 2 being placed on the end otl the said bolt. It' the teeth of a gear, g, and a. tooth, 1.3 or 1.4, do not properly 'mesh with the teeth ot' the rack-bar, then the box and shaft ot' the said gear will yield and permit the rack to move and not break the mechanism.

Instead ot' gear 8 herein shown, I desire it to be understood that I might employ a gear like the gears marked d or e6 in my said patent, and move it longitudinally, as in my said patent, to'bring one or the other of its isolated teeth properlyin position inline with the teeth of the moving lack-bar Bas the said gear and teeth are operated in the said patent to place the isolated teeth in line with the teeth ot' the rotating master-gear therein described.

In the drawings the tooth Z4 of the hub cooperating with the gear gof the shaft f4 is shown in position to be engaged by the teeth ot' the rack-bar as the latter is moved in its downward stroke.

Spring n, only partially shown in the drawings, and attached to holding devices m, are and will be as in my said application referred to.

I claim- 1. The reciprocating rack-bar provided near its ends with a series of teeth, combined with two gears having two series ot' teeth, and with intermediate teeth which may, when desired, be placed alternately' in line with the teeth ot' the rack-bar when the latter is to move the said gear and its shaft a semi-rotation, substantially as described.

2. The shaft c3, its attached gear, and the spring-heldjournal-box for thesaidshat't, combined with the movable toothed rack or surface to engage and actuate the said gear intermittingly, whereby the said gear and its shaft aret'ree to move away from tliesaid toothed surface should the latter and the gear fail to strike properly into mesh, substantially as described.

In testimony whereot'l have signed my name to this specitcation in the presence of two subscribing witnesses.

HORACE ,WYMADL \Vitnesses:

G. W. GREGORY, Vl. B. SYME. 

